package cn.com.wenyl.examples.seata.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Mr.Wen
 * @version 1.0
 * @date 2021-10-28 15:12
 */
@Configuration
public class CustomFastJsonConfig {
    @Bean
    public HttpMessageConverters configureMessageConverters() {
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        FastJsonConfig config = new FastJsonConfig();
        config.setSerializerFeatures(
        // 保留map空的字段
        SerializerFeature.WriteMapNullValue,
        // 将String类型的null转成""
        SerializerFeature.WriteNullStringAsEmpty,
        // 将Number类型的null转成0
        SerializerFeature.WriteNullNumberAsZero,
        // 将List类型的null转成[]
        SerializerFeature.WriteNullListAsEmpty,
        // 将Boolean类型的null转成false
        SerializerFeature.WriteNullBooleanAsFalse,
        // 避免循环引用
        SerializerFeature.DisableCircularReferenceDetect);

        converter.setFastJsonConfig(config);
        converter.setDefaultCharset(Charset.forName("UTF-8"));
        List<MediaType> mediaTypeList = new ArrayList<>();
        // 解决中文乱码问题，相当于在Controller上的@RequestMapping中加了个属性produces = "application/json"
        mediaTypeList.add(MediaType.APPLICATION_JSON);
        converter.setSupportedMediaTypes(mediaTypeList);
        return new HttpMessageConverters((HttpMessageConverter<?>) converter);
    }
}
